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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cdd52cfef2c3c6c9414ec260b486d2ab76f7ad5f0581b913b78ef616d57cfa7' 
  AND token = 'g43Ihh4tiBeODS6eZHOHNT4qIjabeZoh2TTSF3zHXX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00123

JSON explain

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