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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3095af1a886b7cbfde74b09df5554032673cf82a73be01092244d4a25f6a925e' 
  AND token = '8Do82owPJnIIexHUAS+7/+eedBwDD1Iscxde15TfbQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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