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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0838bd1dbab7e9b16f76ff478c86a80fcefb3aa806ede2d5fa6efe9acf18a18b' 
  AND token = 'uVVl4BKFFHtlNCZhXuZtQvZyzo3FutQKfE0WfKGoXgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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