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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '669fccf32a29941365e6fd238b2f78c72401fcc5c0d1994f99233dc76ac8fb52' 
  AND token = '8Dy6pNU/ViWdHm95ARItDmENcr31pk8D1Xo/oHcotos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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