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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '782b798744c7c18577d1504918dd5bf9b52cc795fb94855cc9c3463e98179570' 
  AND token = 'siPtSvECHuafI5Zih6/65B1v1nFNxL/5JqJM9Fqdci8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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