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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '212967eb6d848c802bdf1f7c9500c6d75c13a196cf03b4b97dea0e66e0d6c40e' 
  AND token = '6QSkJZAFAeg1yigfD9KCXs0tYxmysjApDUUC6ZU4Us0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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