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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cf2c5b74d1f84c18023d454082991f169cedd450c417b88f8b7b23c572b2938' 
  AND token = 'kI9XkP/VxtKDbdfiB236te5N67HYqG6MhTJWcqVLf/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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