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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3f8cd3f687d2f60f666df76da88c871dd001e8db478f13795f7ee60a31c3d17' 
  AND token = 'icXPumlmbDikZxdjhY0XSaMxs2t2DPdky03tLMzpK4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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