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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd8b53786cc85e04c1295039ceadf188253dfc2699d7a7fbad624ef1ccae45ed' 
  AND token = '6x08P7fbJ83EOlGkV9OYbL7rWjB0U3iKle0fid0dCl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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