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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab426e6c9991431a8317d285b289427aa218a2a7f4031c16857b7b5113410980' 
  AND token = 'pA3ov6UtbqowUcYA31n91hQ6OSXXkhGADbX0tsR0B1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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