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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62bea90ed00cf6c964bd27e0c54d31b305ae3f46c0a88f81886d9466e31d1a59' 
  AND token = 'XL84v2mgb188dxIgEQolAwqs/dMDm5PQxx8lYSByT04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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