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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba4dc45bc39e4144ee3716e27023df72b10bc589ccd466a535bf341041e0541a' 
  AND token = 'Pit85JSPOKToOEA534D08LU9L2OJJumDlLUEhWrXjBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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