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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2400cad9f6866c215e24846234f6926c669e2f7c96268f9ed2bc7701fb7437ac' 
  AND token = 'Nmcsq0KL7vXaQY/eUtbd4QMoV/y4h1xmfkg8b63i//g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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