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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be0bfeb80c1c6790c45f39785727850cf32e481825dcd70e2663ee3989900db1' 
  AND token = 'FKqyU1Ll9lp1PDKBKu2esdyTNDcPJIU4SK9WoCvzcfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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