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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe77760a2215ea28099e36b211e46fd1eceeff1b7582a2d192e5ba6d533bb6eb' 
  AND token = 'UxLqI+xMncvnqrwdiClErEDYuJbl1u+2/GggxxSXFLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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