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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef4542645c9cf7e2ba4faa09b37ca12164c4ce27e6c3fbd7d3395ba3df8e9eb6' 
  AND token = 'fyeGWv9t3V52ttBuRwGTY6WKzJBW8TpztN1MzMoocnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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