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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfb792897862670ed4332744fd13a36fcf5319d815b4f01525c50dfbad535262' 
  AND token = '7WjMlbJPWMcwVKC9mxxW5itEoc7mkSojvawQkhcR8G0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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