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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61c2fbadd060c49774aa153af68cdfe7d794329be8b052ac3becede34c2c5dda' 
  AND token = '3lphcAaqAzH37kgQHd8P24QJpDhQr4Ccnwiz6fLoyoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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