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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8d399388fc8588785e9b6af723bdbbfdf3965d638e17185ed33e842d1dfc8fb' 
  AND token = 'Iqoi4bGDy76vyp8ZqlZ1+5UNoRkEmcEn/alGCcwYR+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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