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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b74b60059d164b090bab0f5a52556b830bf154b6f499b1ffc62ca5556effa4b' 
  AND token = 'BFiG+7VP7BLi7tzFIifkMHlnKO6JRoSvWmfnWTRYmck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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