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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '230d3e1eea093a7e860dcada0826b3c8c1bc323da6d37a54f2d3ef9f6f7278e2' 
  AND token = '+93uCzShUQDZavyY2WnpYkKCsLz6tO6c/GiOa9I+aUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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