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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4014fcc7512c0cbe14d6ef0fe88d8a3ccaf11c90f95730bde07dc6260dc58f7' 
  AND token = 'HXcrO4DJg1TlhhYmA1PWo+Dlc1S0WYXiFgKffatGzc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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