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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fdb9df938c02459ccada5bfa4a687ae7120506a2d41a66c3a6839e28bb691d9' 
  AND token = 'Q9pcLJt+jKfhhhbEtYjf982cB+7SgZu3OhWxRP7i/LE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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