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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbcb9614c35ec1bd4c6ee97fb19ed58b2af5e5dc4751a693a1169bd5d7b8025d' 
  AND token = 'JNUUbfADnaUvG8vWGT16I5P5annLq+GHnMiYBiz1Ku8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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