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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c6c3a6207ab46bc643340911d1e68a2db5971b02bb310f88aa33ff0ddc70ee8' 
  AND token = '8odXpOo+oGacR8K5v3r4HUmDvzoNtWPSBvLtBEi/eQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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