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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eec0f39bd89982362be311f8fcef5462411fd47553cbe7a7c823d3cec1892339' 
  AND token = 'j5QK4xJXitrxRsnCUCtHBwUcgL2M2EeoXyFz8+MCkiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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