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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8888cf6613fe3b94f1243a4a3a6d1659e2ec659f5ed84de66e51fb948431abe' 
  AND token = 'lD+3ns+PtpV1PYo5YDfnhyBi0DkBJYqxLPl8Ka8Nz7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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