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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b17c67300f37e7fb9e74bdccdeaa04e846aef1ba8d11dc7f420a304e0e0ee751' 
  AND token = 'SQnD6ltfuXmubyh5uNf5Z9pb6Zs0j7BRWa9yvUlNmiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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