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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e95d1fd9ae0c164124956f5608a00a309455eea5d5519bbd8998434df7eb473d' 
  AND token = 'atJ+gG+ywU6erVjBvWrz+40Ng7CZq9hEe6fiSjYbjZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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