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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97acc8c688e7586c255a4ddf587a8d678555d7279953062e4ae901fdcf97049e' 
  AND token = '9x+e8IqMkbrmAG2HnxDM+npripy2vFKPV04J7QCoc0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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