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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fc9ffb327d1672598c9e0fc7a756152e7bcdf9b40a20672fa0260f29ebe9e22' 
  AND token = '9JaSvB7sXVQjEOxOoc1i60tV8up2EyxztN09ve8Y93g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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