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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f7f5059c65bbf9791859560e9a6f16f0141ff0d9e42ab227ed384c29740f2fc' 
  AND token = '3q08UF03r8b5OIeIk7VE9i6s7dbe5spWccF/Tt2PkVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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