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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e024daa9d2573cd6c224988df896bd7907da2c64af73e3bb0cf5ae6637604ea9' 
  AND token = 'OPe2NS6z0KG1/Su4XcY9ikWWbblFEDMatqQe6rX+XPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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