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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39cf05aa76d7c339f25912cc4cf6bfcdc4ae17030c1604cc0352674b0e6251ae' 
  AND token = 'rqUIPOVH1LwX4YJWlQD411hEB0fWsKTyP8UcKtgSMh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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