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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdf5ea9a6fbbab17902d62ea32978af3933c05f990f9352dcd5581868268c8ac' 
  AND token = '9xMaJFfyobZfMh/Fj/3LB2tU2rQgBsGt6fCIEdL1djo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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