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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed7ed91b3bb7453f301809a03512bac3e3e5fd12b6439e31a24ac0f32df51bf4' 
  AND token = 'txtruA5V+eNDBknHOsutT7n1MjIc6hEwApl/TbdY+3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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