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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff1d06647f8a296fc01cc05572fa1516d69af4312e10cdf8eadf06bee977271e' 
  AND token = 'q8yj88W1/y+ROBDfy8LUwxlVn9vn+N6xuATkddOCqVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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