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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2614b3bdd7326dd7db20d138194c674105c141845e5568c46fbb33a74b2d4866' 
  AND token = 'GtkNwZ22N2hLigM2z55BYlQCq4robwyY12Z3ldLCPFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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