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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab9bf7df8f5064ee6ca53bee017aaf34223b391379d409740f527430e28a3cac' 
  AND token = '6X16sXw7Y0Mv0S/CrtPPC00LpP/7c3ic2ge3zDsh+B4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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