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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10233e255feda2083c941ffde446ff5f14db60e4d8cf1c718964adf550a5d01e' 
  AND token = 'vIX0GNb7kPKkAmPI7YSUIqxhcIRIXMDgHijhupWP+2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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