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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1f9fa9b580c8b2281fd8661b624ff5449697fe491137aa6573705d8802026c8' 
  AND token = 'iXw9qLHmJvb5om90+qsdlRdlgLt9TePGyM7dvg/r+78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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