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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '099dbd78e58c182a41287d110bf7d58ab90207fd946fff65cbd0dbf1e7062d7c' 
  AND token = 'aYTLNCh9Mg2JbPSap4wq6rDL4v7CviwQL1F4tgEnIds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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