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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79caddb68676a715dc320c966b9914889559b05335ea7162cd03d9d4e53a24b1' 
  AND token = 'H4f1/cGEwfSLiK36TvQlMYFPOxokwW5judi9gnFSR8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00085

JSON explain

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