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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de827998300190cd386c9b37a443e566bd01a29558203f9caa32f1d6589dceed' 
  AND token = 'Exc8zEPkIttkEuMQxzTXCxYHJR2AxtitcMuvU08y7n8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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