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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea3c5b2a9ec0ab3e51756a9ca77365e5ff9feb0240180a7181c92529a6f6c0e2' 
  AND token = 'DIpk+9DozqyS/npRnIjj7CkehyukzhLM/LjmB7vX4pQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00100

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}