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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f80961a4483d6292359edc17de8826955e84dbadebbe70e6e8f13319e4ad8758' 
  AND token = 'pOuw5Mw4ryZwO9XtJi1OMB2LiPB0KYCiawWU+ZSvR0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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