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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0219f80bbe1687adb7d67c60de154aa5330f211a8631dfbbc5e4f804b7bde4ee' 
  AND token = 'S1svSjhiDM5RdBukQ7TEeix9DZ+lFnDqevS2AbLmaPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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