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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc34962eb13d6f67f8b77568ca92b5de825da18a1e066983b58b4e6eaef377d2' 
  AND token = 'WtcmboxjplJBOtP8In/S0egDWPbLYrULslWtCQ/MmDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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