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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae81ad7018d30b3b132d2193cebf5725583e055ebaff98e106af713d598e6445' 
  AND token = 'Mpghah84/qHq/SbarLuypqg2It5XAaubRz1UTYmKWJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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