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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '524ca769516e5bae25249b237eabc55aa99f2ef61b442fc3651cb213122ba35c' 
  AND token = '34z3RkbT79Wu5ysZl7Fqwm722jD7IipjfT+RI79ccTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00097

JSON explain

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