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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39465b977f87ad1fab520842ff41e768f96510384ce9486655fa994e7e1b789d' 
  AND token = 'kM6A63abK8weqzgcrJrOn4e8obRLcVQ33YQMQGr55eY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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