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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26db301b6d3eba0411b509fccf031dc96d49c3f6a86b3e086d1b6424137391d7' 
  AND token = 'nxLWMC83UtukFyb2KOjRj7tRA3VXvlUxKLaWVxyXGkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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