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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8adf70fb7787319808ad3752ea9979eb4e6fe456cdbf7e7449889ddf2dec25f6' 
  AND token = 'vJ2HGQVclAsMoRt816x3Oouv5e1TqVu3jyMJTn/UXAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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