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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '250567902f288a746c86f52551d8bdc97f67c61cc27dd2ba6e8478b88c2f9e30' 
  AND token = 'SesJ1YhOP1R2VDAkvTWM5dhnH1ivCjrD4CjagidSyy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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