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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3911cfe525955e4e8eef374394311705cb703c9e651c9a15a23556d79dc3e145' 
  AND token = 'kg9rmM64pOW46Y95ApnFA18AVuIOxPGh6ZJtq/c+DVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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