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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0f027eb7aeff9e85976b6e72b843b6a0086bf3aa16c6ca94982ce809c175e47' 
  AND token = 'noDpH2eiK3lSMjg/EKYEPsOcSfxs6ninGzPKpVo/yW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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