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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a45f8f6e94b0dfc790b0876b664f34ff609dcf7949b3de13b7da7688c3552696' 
  AND token = '30jYSGWkjx5iXuCPfeHzkLFcvVTcloWk73dCxL8eAz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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