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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30b87bce619b40ee3b1602780b77a896973f1c2555d63144180f0ac87e9d1979' 
  AND token = 'aUh47EFO/gUojzZVdTSNOqznRdoPVUiLu6WKrscgnUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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