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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9f0aeb6daaf302cde15cf73271933f58b6eec68f369a5bf22ae3b0e90a8f4a4' 
  AND token = 'jlVMCfVDb8IXUJBsPXlnwxa7YOOZ0B2e2ngKJclZkHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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