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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96975e944b323002dd4ed4f08212563d5ba93f01776ba11aaf4f1f85e3d697fe' 
  AND token = 'Dot36x7hXM67y3wamtJb4M12bqg7Ns93pMh7a+ClmfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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