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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9e94ce29c816f2d91eff8f7fd70fbab51e3e0d2cbf92bed29bf98825a75b52e' 
  AND token = 'LYGUewRpbaGYZi0QN++KkhHWaXkCn8GbFi7LXdE75OE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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