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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de6fc23cf20b1740f0cbec1b1515618264baaf1c038fd7a923444796769f0c4c' 
  AND token = '3m7uDekLLtP+qekaTKLBFaShKtYwSi1BlC3xTdE8+Sg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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