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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd30b12412d51557c1d9b6591a53c8196e5d57d5eea3851c8d12cc1bb0dd55cff' 
  AND token = 'WfDaXqPJ4YKl1bvPMQeMDAQilP+ShOgYJm7v/GY6ZiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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