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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4706ff5c3ba2e1f5824115ac9986d3aee2328a3632c74c931b6c5a6937ba4bbd' 
  AND token = 'lM6AKuuff+93vjogsJ4ZDDRmxdpCN/xgEqdPn73iEcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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