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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08b4eda3337119c56abef0e8960e1595ec5e76ad56941e3b69b87e1aac165dfd' 
  AND token = 'nHhhzZdjAmbiEwDhmLxVXuI3PhwdsmcBy1fPr6z42Es=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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